Have you created a customizing request in the front end system before accessing the launchpad designer? What ever changes you do in the launchpad designer (modify existing catalogs/tiles or create new ones) you have to click on the setting icon in the launchpad designer at the top right corner and then select the customizing request - subsequently what ever changes you perform in the designer get written in this customizing request.
Refer this link Setting Default Transport Request Information from Launchpad Designer - User Interface Add-On for SAP NetWeaver - SAP Li…
Regards,
Saurabh